Debian Sid/Sidux/Aptosid are supported directly by a repository containing Music and Multimedia software. These are bleeding-edge packages, so a recent dist-upgrade (year 2010) from Sid repository is mandatory. In order to download software from this repo, you must add this line to your repositories:
1, there is not sidux any more.
2, recent dist-upgrade (year 2010)? it's not quite recent. 8)